Wow! You've encouraged me that it's possible!
However, I'm afraid it's going to take a while for me to catch on to this. I've never used scripts at all (in OS X or in InDesign), so I need to learn some things. I subscribe to lynda.com, so maybe I could watch some video on how to do scripts, etc. there. However, I don't see anything on CS4 and scripting there.
One thing that will make my use slightly more complicated is that it'd be best to check the text following the to-be-changed-text and see if it is followed by any number of digits (up to 3) , a colon and any number of digits (up to 3). If so, the change should be made; if not, it should not be made. I realize all that is possible, and now I see how ID intends for us to do it. But this seems rather daunting to me. I don't even know how to run the scripts :) I'd like to see a sample file of say all the English month names being converted to another language via script if and only if they are followed by a space and up to 3 digits and then a colon and up to 3 digits again. So “January 123:321” would be changed to “Januar 123:321”, but “January” alone would not be. Then I might be able to imitate what I need and use it.
Any idea where best on the web to learn the scripting I need? (I have lynda.com's ID Beyond the Basics DVD (by David Blatner), but it doesn't seem to have any scripting chapters in it.
Sincere thanks!